in the past i have glued/epoxied a cork to the inside of a bottle cap. drilled a hole through the cap and cork, then shoved a piece of rigid tubing through the hole. then glued/epoxied around the rigid tubing at both ends.

LePage 5 minute epoxy. I bought an airline hose joiner (for attaching 2 lengths of airline) and drilled a hole in the cap and stuffed the joiner in there until it made contact. Sanded all surfaces lightly and epoxied. It's going to be on there long after we're dead and buried.

A brass connector might work too, I could never find any that were small enough and had a nut that was big enough.

Regarding glue... I use little plastic nipples, or even those airline connectors. Drill a hole that makes them fit very tight, a ring of glue, push it in, let it dry. Sanding the cap might help.

I have tried regular aquarium silicone, and wasn't happy with it. Brand-wise, I mostly used Elmers Stix-All adhesive, which dries pretty fast, but doesn't become too hard. Per Anonapersonas recommendation, I recently experimented with "Liquid Nails" adhesive, which is very smelly, so it needs to dry a couple of days, and it gets rather hard, but sticks well to the bottle caps that I used.

Unfortunately they aren't. I bought a pair of those. Fit real tight in the caps and all, that wasn't the problem with the bulkheads. What was the problem is that the airhose doesn't fit tight on them. Go figure.. I would have had to try to seal the airhose (tried multiple kinds, including co2 tubing, brand new, never connected or stretched onto any nipples/fittings) and that would just make the whole process worthless. What good are the nipples if the hose has to be glued to them. If I have to glue the hose to the bottlecap, why spend extra money on the bulkheads. Anybody else had the same experiences with these? I ordered them from towerhobbies a few months back.

On another note, I use liquid nails, or one of it's plastic sealant knock offs and just seal around the outside of the cap with the hose in it, works well. Scuffing up the bottlecap is a great idea, and I'm going to give it a try next time.

I used the nut on the top right then the threaded brass tube and the 2nd nut just under the fuel cap. You just drill the hole to fit the brass pipe snugly and screw the nut in. Works perfectly. I did that last night and so far so good. No glue was used. I am thinking of gluing the top nut.

Your basic airlines fits perfectly.

As for the bulkhead that oldfarm house suggested, I also was thinking of using that. Matt perhaps the airline we use does not fit but you can get fuleline from Tower or anywhere else and they will fit perfectly. Because these bulkheads are used for RC Jets, and I am sure it works on those, as jets work on high pressure. So I guess aquarium airlines may not fit but RC has loads of silicon fuel lines in different diameters, I am sure one will fit.

My only worry is that eventually the CO2 will leave deposits on the brass and maybe clog the brass pipe. But let me tell you the brass pipe and nut fit together amazingly tight. It would be advisable to put in rubber washers then tighten the nuts which will be like an extra seal. The cap might blow out, if it has too but the nut will never come off. Try it Wasserpest.

This is my first CO2 expiriment and after 12 hours I am getting bubbles but on turtle pace, I hope it will start working in another 12? i keep looking for bubbles

Hi Skyfish. The post doesn'nt seem to work for me. The problem with using fuel line with the other one is it still won't fit on the other end of my internal reactor (coming)which will need a standard airline. I should call my buddy at his machine shop and have some made for this. I bet I can sell a bunch of them. (cheap of course)

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